如何将 JSONObject 转换为 JSONArray？

Question

最近在一个AndroidAPP中实现评论功能遇到了问题

user.js中的注释定义如下

comnents: [{

    ownerID: {
        type: String,
        required: true,

    },
    commenterID: {
        type: String,
        required: true,

    },
    commenterName: String,
    content: {
        type: String,
        require: true,

    }
}],

我有这样的请求：

{
    "_id":"60d204d6efc6c70022b08dc4",
    "comments":[
        {
            "ownerID":"60d204d6efc6c70022b08dc4",
            "commenterID":"60d205afefc6c70022b08dc8",
            "commenterName":"Bob",
            "content":"Hello World!"
        },
        {
            "ownerID":"60d204d6efc6c70022b08dc4",
            "commenterID":"60d20892efc6c70022b08dd2",
            "commenterName":"Alice",
            "content":"Hello Earth!"
        }
    ]
}

这是我的API

router.post("/writecomment",jsonParser,
    async(req,res,next)=>{
        const errors=validationResult(req);
        if(!errors.isEmpty()){
            return res.status(400).json({erros:errors.array()});
        }
        
        User.findOneAndUpdate(
            { "_id": req.body._id},
            {
                $set: {
                    comments:req.body.comments
                }
            },
            {overwrite:true},
            function(err,resp){
                if(err) throw err;
                if(resp) {
                    return res.send({
                        msg:' change successfully'
                    });
                }else{
                    return res.status(403).json({ success: false, message: 'Failed to change'});
                }
            }
          )


    }
)

如何将“评论”从请求转换为评论数组？或者有更好的方法实现这个功能？

PS: 我使用Mongoose + Express Framework开发

Answer 1

const commentArray = [...req.body.comments]

会为您做这个：

[
    {
        "ownerID": "60d204d6efc6c70022b08dc4",
        "commenterID": "60d205afefc6c70022b08dc8",
        "commenterName": "Bob",
        "content": "Hello World!"
    },
    {
        "ownerID": "60d204d6efc6c70022b08dc4",
        "commenterID": "60d20892efc6c70022b08dd2",
        "commenterName": "Alice",
        "content": "Hello Earth!"
    }
]

基本上这里发生的事情是，我们正在迭代您获得的响应并将结果保存在一个数组中。如果您想了解有关 ... 运算符的更多信息，请查看此 link： https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax

如何将 JSONObject 转换为 JSONArray？

How to convert JSONObject to a JSONArray?

android

json

backend

node.js

express